It is set at the factory and keeps students from cranking the high power objective lens down into the slide and breaking things. Condenser Lens: The purpose of the condenser lens is to focus the light onto the specimen.
Condenser lenses are most useful at the highest powers x and above. Microscopes with a stage condenser lens render a sharper image than those with no lens at x. If your microscope has a maximum power of x, you will get the maximum benefit by using a condenser lenses rated at 0.
A big advantage to a stage mounted lens is that there is one less focusing item to deal with. If you go to x then you should have a focusable condenser lens with an N. Most x microscopes use 1. The Abbe condenser lens can be moved up and down. It is set very close to the slide at x and moved further away at the lower powers. Diaphragm or Iris: Many microscopes have a rotating disk under the stage. This diaphragm has different sized holes and is used to vary the intensity and size of the cone of light that is projected upward into the slide.
There is no set rule regarding which setting to use for a particular power. Rather, the setting is a function of the transparency of the specimen, the degree of contrast you desire and the particular objective lens in use. How to Focus Your Microscope: The proper way to focus a microscope is to start with the lowest power objective lens first and while looking from the side, crank the lens down as close to the specimen as possible without touching it.
Now, look through the eyepiece lens and focus upward only until the image is sharp. Once the image is sharp with the low power lens, you should be able to simply click in the next power lens and do minor adjustments with the focus knob.
It is the piece which connects the eyepiece to the objective lens es. The bottom piece of the microscope which provides support and stability for the microscope on your desk or tabletop is called the microscope base.
This part of your microscope allows you to rotate the lenses and choose the magnification level which is most appropriate for your application. Generally the shortest objective lens will be the lowest power, and the longest objective lens will provide the greatest magnification level. Most microscopes have stage clips, which are used to secure your microscope slide to the stage for observation.
This is the part of a microscope which connects the microscope tube to the base of the microscope. The coarse focus knob makes it easier to adjust the height of the objective over greater distances than the fine focus knob, zooming in and out quickly to find the right level for observation.
Usually the low-powered objective lens is used when making coarse adjustments with this knob. The fine focus knob gives you more control in adjusting the height of the objective over smaller distances, helping you bring the specimen into focus at higher magnifications. Your microscope diaphragm is the part which helps to control the amount of light which is passed through the opening in the stage. This allows you to control the amount of light which passes through your specimen to get the proper conditions for observation and analysis.
If you cannot focus on your specimen, repeat the above steps and work from objective to objective until the higher power objective lens is in place. General Advice: You should check to see if your compound microscope has a rack stop.
If it does not have one, then be careful not to allow the objective lens to touch the slide as you may break the slide. When using a monocular microscope, the correct technique is to look through the eyepiece with one eye and keep the other eye open. Most new users, tend to close one eye. While many microscopists do close one eye, you will help avoid eye strain by keeping both eyes open. Finally, remember! When you view a specimen through a microscope, you are viewing an image through multiple lenses.
0コメント